Authentic
graded by Al-Albani
Mishkat al-Masabih 413
Narrator:Ibn ‘Abbās
وَعَنِ ابْنِ عَبَّاسٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَسَحَ بِرَأْسِهِ وَأُذُنَيْهِ: بَاطِنَهُمَا بِالسَّبَّاحَتَيْنِ وَظَاهِرَهُمَا بإبهاميه) (رَوَاهُ النَّسَائِيّ)
Ibn ‘Abbas said that the Prophet wiped his head and also the inside of his ears with his forefingers and the outside with his thumbs. Nasa’i transmitted it.
Cited in Mishkat al-Masabih (No. 413).